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Features: Built-in buzzer about 110 decibels, if you don't need a buzzer, Do not connect the brown line. It can be rotated 90 degrees and can be mounted on the side or top of the machine. Adopting high quality material, sturdy and durable in use. Upgraded version of the constant light beads, high brightness and long life. Steady-on lighting in red & green light color. Foldable base design, easy and convenient to use. Suitable for outdoor, engineering construction, bridge crane, all kinds of CNC machine tools and automation equipment, aquaculture, etc. Specification: Material: AS, ABS, Metal Weight: 210g/7.4oz Mode: Always on Voltage: AC 110V Alarm sound: Buzzer